Annual temperature range:
16.4 C°
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Which type of aquifer is most common in the United States?
A) sand and gravel B) igneous and metamorphic rock C) sandstone D) limestone
Wheat developed as part of the Green Revolution was specially selected because of its ability to
A) produce high-yields of grain. B) resist prolonged droughts. C) naturally produce pesticides. D) produce grain with high levels of iron.
Why are floods so common along the Red River of the North (in North Dakota, South Dakota, and Minnesota)?
A. The Red River Valley is geologically young (about 9,000 years old) and has not carved a deep valley. B. River flow increases as winter snow melts and meltwater runs northward into still frozen parts of the river. C. The gradient or slope of the riverbed is very low. D. All of these choices are correct.
The sharp boundary between a lake's warmer epilimnion and cooler hypolimnion is called the benthos.
Answer the following statement true (T) or false (F)